The condition in which there is deterioration of the

myelin sheaths of neurons in the brain and spinal
cord is
a. muscular dystrophy.
b. cancer.
c. diabetes.
d. multiple sclerosis.
e. Alzheimer’s disease.


Answer: d

Biology & Microbiology

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After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.

A. All the vegetation that had been produced in warmer times decayed and released carbon dioxide. B. There was an increase in aerobic bacteria that released large amounts of carbon dioxide. C. There was an increase in oxygen that stimulated respiration and hence greater production of carbon dioxide. D. The low carbon dioxide levels caused cooling of the Earth, resulting in the decline of ancient vegetation; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. All of the other choices provided are incorrect.

Biology & Microbiology

What type of tissue covers body surfaces or lines cavities?

a. muscle b. nerve c. endocrine d. epithelial e. connective

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What group is represented by all of the bacteria species E. coli living inside a cow's intestine?

A) community B) population C) ecosystem D) demographic transition

Biology & Microbiology

The exchange of genetic material during crossing over causes which of the following?

A) homozygosity B) genetic variation C) heterozygosity D) stasis

Biology & Microbiology